Changes in the zinc content in the meadow sward under conditions of a long-term static fertilizer experiment (Czarny Potok).

摘要

The changes in the zinc content in the meadow sward were studied in a long-term fertilizer experiment set up on a mountain meadow in Czarny Potok, Poland, during 1968. The experiment was localized at 720 metres above sea level on Dystric Cambisols and comprised of 8 fertilizer treatments in two series: 0Ca and +Ca. In the course of the experiment, the Zn content in the sward decreased and the time factor showed greater influence than fertilizer application, P content in the sward or soil and acidification. In mountain meadow communities shaped by long-term (over 30 years) NPK treatment and at yields between 6.7 and 7.1 tonnes/ha, the annual quantity of absorbed Zn ranged between 233 and 256 g Zn/ha dry weight. During the experimental period, the highest amount of Zn removed with the sward yield exceeded 500 g Zn/ha annually. In the limed series at slightly higher yields, the quantity of Zn removed with the yield was over 10% lower in plots receiving NPK fertilizer application than on the same treatments in the unlimed series. Liming was able to reduce soil Zn abundance..